Thanks to another poster here, I've found what I THINK will work for my new setup. Here's what I am trying to end up with.

An in-dash DD case from www.bybyte.com with built in LCD
I cant tell from their site if they offer a case/LCD combo that allows for a mini-itx MB with a PCI slot (which brings me to my next challenge)

Is there a preferred mini-itx board that has a PCI slot?

Do any nano-itx boards include a PCI slot?

I want the PCI slot so that I have a wider choice of sound cards.

If I can get these things ironed out, I'll start ordering parts.